640-Gbps/Carrier WDM Transmission over 6,400 km Based on PS-16QAM at 106 Gbaud Employing Advanced DSP

被引：26

作者：

Kong, Miao ^{[1
]}

Wang, Kaihui ^{[1
]}

Ding, Junjie ^{[1
]}

Zhang, Jiao ^{[1
]}

Li, Weiping ^{[1
]}

Shi, Junting ^{[1
]}

Wang, Feng ^{[1
]}

Zhao, Li ^{[1
]}

Liu, Cuiwei ^{[1
]}

Wang, Yanyi ^{[1
]}

Zhou, Wen ^{[1
]}

Yu, Jianjun ^{[1
]}

机构：

[1] Fudan Univ, Shanghai Inst Adv Commun & Data Sci, Key Lab Informat Sci Electromagnet Waves, Shanghai 200433, Peoples R China

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2021年 / 39卷 / 01期

关键词：

Optical attenuators; Optical amplifiers; Stimulated emission; Optical filters; Optical fiber amplifiers; Bandwidth; Probabilistic shaping; Volterra nonlinear equalization; pre-equalization; ultra large effective area fiber; Raman amplifier; high-speed DAC; 400 GB/S TRANSMISSION;

D O I：

10.1109/JLT.2020.3024771

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We experimentally demonstrated a 5-channel 125-GHz-grid wavelength division multiplexing (WDM) transmission over 6,400-km Raman amplified ultra large effective area fiber (ULAF) with 848-Gbps/carrier line-rate and 640-Gbps/carrier net-bit-rate. Our transmission is based on probabilistically shaped (PS) dual-polarization 16-ary quadrature-amplitude-modulation (16QAM) considering 25%-overhead low-density parity-check threshold of 4.6 x 10(-2) bit-error-rate. By utilizing a high-speed digital-analog-converter (DAC) with a 3-dB bandwidth of 35 GHz and innovative pre-equalization based on 4-level pulse-amplitude-modulation (PAM4), 106-Gbaud 16QAM signal is reliably generated and transmitted. Besides, the transmission distance is improved obviously by using ULAF and Raman amplifier. Our results show that the PS-16QAM outperforms the regular-16QAM by around 1.5-dB sensitivity gain and 33% transmission-distance improvement. Furthermore, we have successfully applied Volterra nonlinear equalization (VNLE) to ultra-long-haul coherent optical transmission and proposed a modified offline digital-signal-processing process. By utilizing VNLE, another 15% reach improvement is obtained for PS-16QAM signal. Our work can provide an effective solution for a 600G+ ultra-long-haul transmission. As we know, this is the first time to achieve 640-Gbps/carrier WDM transmission over 6,400 km based on 106-Gbaud PS-16QAM.

引用

页码：55 / 63

页数：9

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